The income of a broker remains unchanged though the rate of commission is increased from 4% to 5% . The percentage of slump in business is :
Suppose the business value changes from A to B.
4 % of A = 5 % of B `rArr 4/100 A = 5/100 B rArr B = 4/5 A.`
`:.` Change in business = `(A - 4/5 A) = A/5`
percentage slump = `(A/5 xx 1/A xx 1/100)`% = 20%.
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